Experimental Study On Dielectric Barrier Discharge Synergistic Catalytic Degradation Of O-Dichlorobenzene

With the improvement of people’s living standards in our country,the amount of VOCs(Volatile Organic Compounds)emitted from production and life has also increased year by year.VOCs can easily cause air pollution,water pollution and soil pollution,and have already brought great pressure to our country’s ecological environment.Studies have shown that the use of non-thermal plasma and catalyst synergistic degradation technology can promote the decomposition and deep oxidation of VOCs pollutants,and has the advantages of high efficiency,simple operation process,and large processing capacity.Therefore,this paper takes o-DCB,a typical chlorine-containing and benzene-containing VOCs pollutant,as the target pollutant,and studies the removal of it with DBD(Dielectric Barrier Discharge)combined with catalysts,through experimental and theoretical analysis the process of catalytic degradation of o-DCB by DBD is studied and discussed by means of experiment and theoretical analysis.This paper studies the degradation process of o-DCB with DBD and DBD synergistic catalysts,which provides a reference for industrial applications.The main experimental conclusions are as follows:(1)In the process of degrading o-DCB by DBD,the degradation rate of o-DCB increases with the increase of SIE,and decreases with the increase of reactor temperature.The overall degradation rate is low.When the SIE=410 J/L,the degradation rate is about 30%.Increasing the peak voltages and output frequencies can effectively increase the SIE.Under similar output parameters,the degradation rate of the pulse power supply is better than that of the AC power supply.At the same time,it was found that a large amount of residual O3 was detected in the exhaust gas after DBD degradation,and the O3 concentration has a linear relationship with the SIE.(2)During the degradation process of DBD synergy with V-Ti catalysts,compared with the degradation of o-DCB by DBD,the degradation rate after combining the catalysts has been significantly improved.At room temperature,when the SIE=400 J/L,the degradation rate of o-DCB can reach 49%.In the range of 25～150℃,increasing the temperature can effectively improve the catalytic activity of the catalyst.Under the experimental conditions of 150℃ and SIE=202 J/L,the degradation rate of o-DCB can reach 51%.(3)In the experiment,a self-made Ce-based molecular sieve catalyst was combined with a DBD to degrade o-DCB.The experimental results show that the degradation effect of DBD combined with Ce-based molecular sieve is significantly improved.Under the experimental conditions of 180℃ and SIE=301 J/L,the degradation rate of o-DCB can reach 74%.The experimental results compared with related literature have been significantly improved.(4)Through the GC-MS(Gas Chromatography-Mass Spectrometry)analysis of the gas phase by-products,it is found that the increase in SIE is beneficial to the destruction of the benzene rings to generate small fragments of by-products,but it will also produce more complex organic by-products.